Improvement in chimney-jacks



F. M. CAMPBELL.

Chimney-Jack s.

I P atentedlan. 5,1875.

M My UNrrED 'TATEs PTENT OFFIoE;

FRANK M. CAMPBELL, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN CHlMNEY-JACKS.

Specification forming part of Letters Patent No. 158,3(i0, dated January5, l3'i5 application filed November 16, 1874.

To all whom it may concern:

Be it known that I, FRANK M. CAMPBELL, of St. Louis, in the county ofSt. Louis and State of Missouri, have invented certain new and usefulImprovements in SmokeJacks and Ventilators, whereof the followingis aspecification, reference being had to the accompanying drawings, makingapart thereof, wherein Figure-1 is an exterior view of the jack.

- Fig. 2 is a top view, having the cap removed.

Fig. 3 is a horizontal transverse section.

Like letters of reference refer to like parts in the several views.

The nature of this invention relates to a chimney-jack and ventilator,and the object whereof is to prevent chimneys from smoking, and whichmay, also, be used for ventilating purposes.

The construction of the aforesaidinvention, and the operation of thesame, are as follows:

The jack is constructed of sheet metal, and, externally, of the shapeshown in Fig. 1. The body of the jack consists of four rectangularflues, A, whose inner walls, B, inclose a space, 1, as seen in Fig. 3.The spaces 0 between the walls open to the outside, but are closed atthe bottom and also at the top, excepting at the center, 6, which isopen. The whole top may be left open, but it is better that it bepartially closed. The outer corner of each of the flues is open, as willbe seen at b, Fig. 3, the edges or sides of which are turned outward atright angles and then back in direction of the side of the'flue, formingrectangular laps of the edges, as seen at c. The open corners of thefiues are covered with a shield, 1), the sides of which extend so farinward as to embrace the laps c, as shown in the drawings, wherein itwill be seen that the shield does not cut ofl? the communication of thelines A with the outside, said communication being open, as indicated bythe arrows. The

the lines.

passing through it and up and through the opening 0 in the top, therebyforming a vacuum and inducing a draft from all the openings of thefines, and thus facilitating the escape of smoke from the chimney,passing up therefrom into the flues A, and out of the sides and top ofthe jack into the air. wind blow from the point x it can only strike twoof the openings at c, and that indirectly, for the shield prevents itfrom blowing directly in and stopping the draft on the opposide side;hence, a partial vacuum is formed, thereby inducing a draft in theflues, causing a free escape of the smoke through the open-' ings on thefarther side of the jack. In the event the wind is downward, the hood orcap E will prevent it from going down the chimney. .The above-describedjack is not only a pro tection against smoky chimneys, but is also wellcalculated for ventilating rooms, 850. For this latter purpose theprinciple of its opera tion is the same, and requires no change to bemade in its construction further than some slight modification to adaptit to the particular place where it is to be placed.

What I claim as my invention, and desire to secure by Letters Patent, is

In the herein-described chimney-jack and ventilator, the combination ofthe tines A, inclosing the space I, having outlet 6 and shield D,provided with laps c, in the manner substantially as described, and forthe purpose set forth.

FRANK M. CAMPBELL.

Witnesses:

ANTHONY O. DUNLEVY, J AsA. BROWN.

Should the I

